Data sending method and apparatus

Abstract

A data transmission method and an apparatus are provided. The method includes: determining, by a base station, a time-domain interval of available time-frequency resources in an unlicensed spectrum, where the available time-frequency resources are continuous time-frequency resources in a time domain; sending, by the base station, a preamble signal in a first subframe in the interval, where the first subframe is an initial subframe in the interval; and sending, by the base station, downlink control information and data after sending the preamble signal, where the data is in the first subframe, the downlink control information includes scheduling indication information, and the scheduling indication information is used to indicate a frequency-domain location of the data. According to the present invention, spectrum utilization can be improved.

What is claimed is: 
     
       1. A data sending method, comprising:
 determining, by a base station, a time-domain interval of available time-frequency resources in an unlicensed spectrum, wherein the available time-frequency resources are continuous time-frequency resources in a time domain; and 
 sending, by the base station, downlink control information and data, wherein the data is in a first subframe, the first subframe is an initial subframe in the interval, the downlink control information comprises scheduling indication information, location indication information, and data symbol indication information, the scheduling indication information is used to indicate a frequency-domain location of the data, and the location indication information is used to indicate a time-domain location of the data, the data symbol indication information is used to indicate an end location of the data in the third subframe, the third subframe is a last subframe in the time-domain interval of available time-frequency resources in an unlicensed spectrum. 
 
     
     
       2. The method according to  claim 1 , the method further comprises,
 sending, by the base station, the downlink control information by using a secondary cell corresponding to the unlicensed spectrum. 
 
     
     
       3. The method according to  claim 1 , the method further comprises,
 the downlink control information further comprises a radio network temporary identifier (RNTI), the RNTI is used by a user equipment to receive the downlink control information according to the RNTI. 
 
     
     
       4. A base station, comprising:
 a processing unit, configured to determine a time-domain interval of available time-frequency resources in an unlicensed spectrum, wherein the available time-frequency resources are continuous time-frequency resources in a time domain; and 
 a sending unit, configured to send downlink control information and data, wherein the data is in a first subframe, the first subframe is an initial subframe in the interval, the downlink control information comprises scheduling indication information, location indication information, and data symbol indication information, the scheduling indication information is used to indicate a frequency-domain location of the data, and the location indication information is used to indicate a time-domain location of the data, the data symbol indication information is used to indicate an end location of the data in the third subframe, the third subframe is a last subframe in the time-domain interval of available time-frequency resources in an unlicensed spectrum. 
 
     
     
       5. The base station according to  claim 4 ,
 wherein the sending unit further configured to send the downlink control information by using a secondary cell corresponding to the unlicensed spectrum. 
 
     
     
       6. The base station according to  claim 4 , the method further comprises,
 the downlink control information further comprises a radio network temporary identifier (RNTI), the RNTI is used by a user equipment to receive the downlink control information according to the RNTI. 
 
     
     
       7. A data receiving method, comprising:
 performing, by user equipment, detection on a downlink control channel to obtain downlink control information, wherein the downlink control information comprises scheduling indication information and location indication information, and the scheduling indication information is used to indicate a frequency-domain location of scheduled data in a first subframe; 
 determining, by the user equipment, a time-domain location of the data in the first subframe according to location indication information in the downlink control information or a preamble signal received in an unlicensed spectrum before the downlink control channel, wherein the location indication information is used to indicate the time-domain location of the data in the first subframe; and 
 receiving, by the user equipment, the data in the unlicensed spectrum according to the frequency-domain location and the time-domain location of the data. 
 
     
     
       8. The method according to  claim 7 , wherein the downlink control information comprises data symbol indication information, the method further comprises:
 determining, by the user equipment, an end location of the data in the first subframe according to the data symbol indication information. 
 
     
     
       9. The method according to  claim 7 , wherein the first subframe is a last subframe in the time-domain interval of available time-frequency resources in an unlicensed spectrum. 
     
     
       10. The method according to  claim 7 , the method further comprises:
 receiving, by the user equipment, the downlink control information by using a secondary cell corresponding to the unlicensed spectrum. 
 
     
     
       11. The method according to  claim 7 , the method further comprises:
 the downlink control information further comprises a radio network temporary identifier (RNTI), the RNTI is used by the user equipment to receive the downlink control information according to the RNTI. 
 
     
     
       12. User equipment, comprising:
 a processor, configured to perform detection on a downlink control channel to obtain downlink control information, wherein the downlink control information comprises scheduling indication information and location indication information, and the scheduling indication information is used to indicate a frequency-domain location of scheduled data in a first subframe, wherein 
 the processor is further configured to determine a time-domain location of the data in the first subframe according to location indication information in the downlink control information or a preamble signal received in an unlicensed spectrum before the downlink control channel, wherein the location indication information is used to indicate the time-domain location of the data in the first subframe; and 
 a receiving unit, configured to receive the data in the unlicensed spectrum according to the frequency-domain location and the time-domain location of the data. 
 
     
     
       13. The user equipment according to  claim 12 , wherein the downlink control information comprises data symbol indication information,
 the processor is further configured to determine an end location of the data in the first subframe according to the data symbol indication information. 
 
     
     
       14. The user equipment according to  claim 12 , wherein the first subframe is a last subframe in the time-domain interval of available time-frequency resources in an unlicensed spectrum. 
     
     
       15. The user equipment according to  claim 12 , the method further comprises:
 the receiving unit, further configured to receive the downlink control information by using a secondary cell corresponding to the unlicensed spectrum. 
 
     
     
       16. The user equipment according to  claim 12 , the method further comprises:
 the downlink control information further comprises a radio network temporary identifier (RNTI), the RNTI is used by the user equipment to receive the downlink control information according to the RNTI.